The only board that is cheap and available with the ratified 1.0 vector extension I know of is the Kendryte K230, which you can find on some boards for about $40 USD: https://developer.canaan-creative.com/k230/dev/zh/00_hardwar...

Note that it's only on one 1.6GHz core, and still pretty anemic otherwise (pi form factor, it's to be expected.) So something "deskop grade" with all the nice extensions and other goodies is probably still a ways off. Maybe next year; we'll have to see -- but lots of useful extensions continue to be ratified today, so it may still be a while before things "cool off."